A.S. Mazinov – Ph.D.(Eng.), Associate Professor, 
Department of Radiophysics and Radioelectronics, V.I. Vernadsky Crimean Federal University (Simferopol) E-mail: mazinovas@cfuv.ru

Formulation of the problem. Of particular interest are the current advances in optoelectronics due to the high re-emissivity of organic materials. The main directions of development of modern radio electronics are related to the development of organic field effect transistors (OFET), narrow-band organic light emitting diodes (OLED) and the latest photovoltaic devices, in particular DSSC (dyesensitized solar cell). The use of organic materials, which make it possible to expand the frequency range using cheaper methods of precipitation from solutions, is an urgent task.
The purpose of the work is to study changes in the spectral of electromagnetic radiation in the optical (near IR, visible and near UV) and high-frequency ranges when interacting with thin organic films. Consider the spectral characteristics of electrodynamic parameters in the frequency segments 352−1200 THz, 19.48−119.92 THz and 17.5−26 GHz in artificially synthesized interaction media based on film structures deposited by irrigation from isatin-β-anil solutions, phenylhydrazone isatin, phenylhydrazone 5-bromisatin, phenylhydrazone 5-fluoroisatin, on dielectric substrates.
Practical significance. A complication of the molecular structure of the initial isatin led to a general smoothing of the luminescence spectra, and, when doped with Br and F atoms, to mixing and changing the amplitudes of two characteristic reradiation peaks at frequencies of 617−631 THz (475−485 nm) and 500−577 THz (520−600 nm). At the same time, the spectra in the optic range, upon modernization of the molecular organic structure, showed the presence of two absorption maxima in the frequency range 250−350 nm (856−1199 THz) and 350−450 nm (667−856 THz).
In the microwave range, the coefficient of transmission of an electromagnetic wave through organic structures is higher than that of a clean glass cover substrate. The transmission maxima of organic materials vary with frequency. IβA has a minimum insertion attenuation at a frequency of 19.5 GHz with an indicator of 97% transmittance from the incident power, which is the best indicator among the studied materials, but already at a frequency of 24 GHz this indicator drops to 90.5%. The maximum attenuation of the incident wave is exerted by PHBI with a transmission coefficient of 89% at a frequency of 23.4 GHz. The reflection coefficient of isatins is small, however, in all isatin derivatives, an increase in the reflection coefficient from frequency was found, at a general level greater than that of the substrate.

Mazinov A.S. Interaction of electromagnetic radiation of the optical and microwave ranges with organic films of isatins. Electromagnetic waves and electronic systems. 2020. V. 25. № 3. P. 29−36. DOI: 10.18127/j15604128-202003-04. (in Russian)

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